Thermostat.



l. BOEKEL L l. H. SCHERER.

HER'MosTM. APPLICATiON FILED 0CT.20. 1914.

1 141,605 Patented J une 1, 1915.

Juhus Boekel -Qwmom John NDC Verf M W 33m v i 'PATENT OFFICE.

.TI/ILLUS/BOEKEL AND JOHN H. SCHQEBR, QF PHILADELPHI, PENNSYLVANIA,

assmuons .To san) Bonner.,

' THEM/:Osram T 0 all 'whom 1.'.5 meg] concern.'

De it.. lniown that we, Juntos Bonner. and .Tous Semeuse, citizens of the United States, nesiding; Philadelphia,A in the county of Philadelphia and State of Penn Sylvania, have .invented certain new and useful Improvements Yin Thermostats. .of

` which the following isa specification. l

This invention relates tothermostats of the double-acting, compound metal bar ty'pe and has for its object -to provide an easy means forfreely ,suspending a thermostat of this type in a receptacle, the temperature of which it is to govern, such as an incubator, oven lzc, the thermostatbcing freely inserted or withdrawn at' will;` said object being accomplished by the construction, combination and arrangement of parts herein# after more particularly set .forth and claimed,

In the drawingsf Figure l represents ay front elevation oi' a device embodying our invention, the block carrying the adjustable contact being in cross-section to show the binding post and' electrical connection and the other block being partly in section for the same purpose; F ig. 2, side elevation of the same; Fig. 3, a. cross-sectional View on the line 3-3 of Fig. 2; and Fig. 4, aiview of the block carrying th^ movable contact, partly vin sideelevetion and partly in section, showing the binding post and binding screw and adjacent' parts.

Referring nov.' in detaill to the drawings, 1 designatesa bar carrying on each end a depending segmental plate '2 adapted-to fit over the upstanding collar, neck, ferrule or equivalent tubular -part of a receptacle,v the temperature of which the thermostat is to controLsee'Fig 1, thecollar being indicated in dotted lines` A long vertically depending rod 3 has its upper end riveted through, or otherwise secured to, said har 1 midway between the ends thereof and carries a squared block 4 on its lower end, the comound arms 5 and 6 being fastened by screws l or other suitable means to opposite sides of this block 3 so as to to have their upper ends lie on opposite sides of the bar 1 and on a line at right angle to` the latter, thus being free to more toward or from each other insuring a very quick and delicate governing action. in the present instance these arms 6 are so constructed that Specification of Lettera Patent.

they move toward 'each othfa 15 the heat units decrease and away from eachotheras the heat units increase, but this neednot necessarily be so in allcaseel i f Arm 5 is provided at its upperand free end with an insulating block -19 secured thereto by screws or othersuitable means andfwliich carries the fixed contact 8 mounted ina bushing 9 held in said block 1.9 byv screw-threaded en gement or other suitable means. This ushing 9 is provided in Patented vJ une 1*, 191,5; Applica-tion iledt'togber 20, 1.919,. Serial Nojw.

its rear part with a longitudinal; central bore communicating wiin abore throughthe block 19, thus making a continuous passage for the insertion of the end of circuitwire d, said wire being held in .the bore of th'e'bushing 9 by a binding screw 10 threadeddownward through said block 19 and thefnuppe'r wall of the boicd portionof bushin 9,. The

am; 6 carries a similar insulating .lockl 11 similarly secured to its upper and'free end and in'said block 11 issfecured a. cylindricalV internally and externally screw-threaded bushing 12 provided with an external .re-

cess i4 to receive the lower endof 'a verticall externally screwfthreaded binding K' post 13,`

which has a lateral' bore communicating with a lateral bore through said'block 11 for the insertion ofthe end .0f Circuit' Wire b. A binding screw v1 5 having screwf threaded engagement with the interior of said post l'engages said wire and forces it against the bottom of the bore' through the latter, thus securely holding it in position.

An adjustable tscrew 16 engages-'the internal screw-threads of bushing 12 and carries contact .17 0n its inner endg-thus-perf mitting adjustability of thev thermostatv to varying degrees of heat. A nut 18 turning on said screw 1G between its outer end and the outer end of bushing l2 may be turned or screwed forward on said screw 'to jam against the end of said bushing-12', thus locking the screw 16 `and its contact 17 in any'desired position of adjustment.

Of course the contacts 8 and 17;' are directly opposite each other in order to A make circuit when the two arms 5 and 6 move toward each other; also, the bushing'i), contact 8, contact 17, screw 16 and bindingpost 13 are of material of high electrical conductivity, so that the circuit would be from the source of electrical energy, not shown, through positive wire a, through 'bushing 9, Contact 8, contact 17, screw 16, postll and negative wire b back to the source of electrical energy.

It is quite obvious that various changes 5 and modifications may be made in the construction, combination and arrangement'of the different parts of this invention, of lwhich a preferred form only is illustrated and described, without departing from the spirit thereof, and it is our desire and intention to include all such changes and modiications in the appended claims.

Waving thus described our invention, what we claim as new and desire to secure by Letters Patent is: 1. A horizontal bar, vertical segmental plates attached to the respective ends of said bar and adapted to t over lan upstanding collar, a vertical rod attached to, and depending from, said bar, and a squared block secured to the lower end of said rod, in combination with two compound metal arms y attached at their lower ends to said block and having their upper and free Contactl carrying arms dir ectlv opposite each other to make and breal. the electrical circuit said arms movetoward ory away from each other. j2. A pair of segmental plates adapted to engage a neck or upstanding collar of a receptacle, in combination with means attached to said plates and suspended within said receptacle, a pair of tliermoscopie arms attached to said means, but insulated from $5 leach-other, and extending up between the said plates and electrical contacts carried bv the upper ends of said arms for opening or closing an. electrical circuit. A

3. A pair of electrical contacts and ther- A-1O moscopicelements to which they are attached, in combination with means adapted to ht on the neck or upstanding collar of a receptacle and intervenin means whereby the said thermoseopicy e ements are suspended Within the same.

4. A rod"and means adapted ,to lit on the said arms above said means.

,6. Means adapted to fit on a tubular part, in combination with thermoscopic arms sus` pended therefrom, but extending above said means, electrical contacts carried by the upper ends ot said arms and means for adjusting one of' said contacts toward or from the other.

7. A pair of segmental plates adapted to lit on the neck of av receptacle, in combination with a bar connecting said plates. a rod .suspended from said bar, a pair of thermoscopic arms attached at their` lower ends to vthe lower end of said rod for Lsnspendin them Within the receptacle but insulat d from each other and carrying coperating electrical contacts above said plates for the purpose set forth.

8. A pair of arms adapted to move toward or from each other at their upper ends accordii'ior to changes of temperature and provided with electrical'contacts at said ends, in combination with neans for suspending 80 said arms within a' receptacle, said means comprising elements adapted to tit upon an upstand-i'ng tubular part of the latter.

In testimony whereof, we have signed our names to this'specitication in the presence of 85v two subscribing witnesses.

JULIUS BOEKELJ i JOHN H. SCHERER.

Witnessesz FnEDK. MANGoLD,

R'ionn'r J. HAMILTON. 

